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United States Patent | 5,554,947 |
Saitou ,   et al. | September 10, 1996 |
A wave-shaping circuit is provided which converts an input alternating signal into a pulse signal. The wave-shaping circuit includes a level-adjusting circuit which is designed to integrate the input alternating signal to determine a central level of amplitude thereof for adjusting the central level to a given reference level under feedback control. This compensates for the variation in central level of amplitude of the input alternating signal caused by various noise components contained therein.
Inventors: | Saitou; Mitsuhiro (Oobu, JP); Kabune; Hideki (Chiryu, JP) |
Assignee: | Nippondenso Co., Ltd. (Kariya, JP) |
Appl. No.: | 319549 |
Filed: | October 7, 1994 |
Oct 08, 1993[JP] | 5-253040 |
Current U.S. Class: | 327/184; 327/74; 327/165 |
Intern'l Class: | H03K 012/00; H03K 005/01; H03K 005/153 |
Field of Search: | 327/184,102,104,165-169,74,76,295,354 |
4011507 | Mar., 1977 | Rossell | 327/76. |
4090154 | May., 1978 | Hauchart | 327/168. |
4335301 | Jun., 1982 | Palmer et al. | 327/165. |
4613973 | Sep., 1986 | Dahl | 327/184. |
4764685 | Aug., 1988 | Bleckmann et al. | 307/106. |
Foreign Patent Documents | |||
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61-223572 | Oct., 1986 | JP. | |
62-135773 | Jun., 1987 | JP. | |
260330 | May., 1990 | JP. | |
3181067 | Aug., 1991 | JP. | |
57135 | Jan., 1993 | JP. |